Blame src/logic/slbt_exec_compile.c

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/*******************************************************************/
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/*  slibtool: a skinny libtool implementation, written in C        */
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/*  Copyright (C) 2016--2018  Z. Gilboa                            */
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/*  Released under the Standard MIT License; see COPYING.SLIBTOOL. */
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/*******************************************************************/
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#include <string.h>
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#include <stdbool.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <slibtool/slibtool.h>
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#include "slibtool_spawn_impl.h"
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#include "slibtool_mkdir_impl.h"
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#include "slibtool_errinfo_impl.h"
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#include "slibtool_metafile_impl.h"
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static int slbt_exec_compile_remove_file(
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	const struct slbt_driver_ctx *	dctx,
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	struct slbt_exec_ctx *		ectx,
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	const char *			target)
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{
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	int fdcwd;
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	(void)ectx;
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	/* fdcwd */
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	fdcwd = slbt_driver_fdcwd(dctx);
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	/* remove target (if any) */
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	if (!unlinkat(fdcwd,target,0) || (errno == ENOENT))
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		return 0;
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	return SLBT_SYSTEM_ERROR(dctx,0);
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}
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static int slbt_exec_compile_finalize_argument_vector(
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	const struct slbt_driver_ctx *	dctx,
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	struct slbt_exec_ctx *		ectx)
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{
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	char *		sargv[1024];
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	char **		sargvbuf;
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	char **		base;
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	char **		parg;
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	char **		aarg;
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	char **		aargv;
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	char **		cap;
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	char **		src;
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	char **		dst;
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	char *		ccwrap;
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	/* vector size */
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	base = ectx->argv;
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	parg = ectx->argv;
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	for (; *parg; )
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		parg++;
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	/* buffer */
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	if (parg - base < 1024) {
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		aargv    = sargv;
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		aarg     = aargv;
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		sargvbuf = 0;
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	} else if (!(sargvbuf = calloc(parg-base+1,sizeof(char *)))) {
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		return SLBT_SYSTEM_ERROR(dctx,0);
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	} else {
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		aargv = sargvbuf;
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		aarg  = aargv;
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	}
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	/* (program name) */
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	parg = &base[1];
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	/* split object args from all other args, record output */
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	/* annotation, and remove redundant -l arguments       */
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	for (; *parg; ) {
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		if (ectx->lout[0] == parg) {
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			ectx->lout[0] = &aarg[0];
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			ectx->lout[1] = &aarg[1];
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		}
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		if (ectx->mout[0] == parg) {
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			ectx->mout[0] = &aarg[0];
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			ectx->mout[1] = &aarg[1];
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		}
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		/* placeholder argument? */
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		if (!strncmp(*parg,"-USLIBTOOL_PLACEHOLDER_",23)) {
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			parg++;
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		} else {
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			*aarg++ = *parg++;
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		}
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	}
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	/* program name, ccwrap */
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	if ((ccwrap = (char *)dctx->cctx->ccwrap)) {
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		base[1] = base[0];
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		base[0] = ccwrap;
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		base++;
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	}
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	/* join all other args */
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	src = aargv;
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	cap = aarg;
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	dst = &base[1];
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	for (; src
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		*dst++ = *src++;
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	/* properly null-terminate argv, accounting for redundant arguments */
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	*dst = 0;
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	/* output annotation */
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	if (ectx->lout[0]) {
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		ectx->lout[0] = &base[1] + (ectx->lout[0] - aargv);
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		ectx->lout[1] = ectx->lout[0] + 1;
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	}
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	if (ectx->mout[0]) {
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		ectx->mout[0] = &base[1] + (ectx->mout[0] - aargv);
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		ectx->mout[1] = ectx->mout[0] + 1;
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	}
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	/* all done */
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	if (sargvbuf)
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		free(sargvbuf);
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	return 0;
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}
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int  slbt_exec_compile(
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	const struct slbt_driver_ctx *	dctx,
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	struct slbt_exec_ctx *		ectx)
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{
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	int				ret;
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	char *				fpic;
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	char *				ccwrap;
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	struct slbt_exec_ctx *		actx = 0;
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	const struct slbt_common_ctx *	cctx = dctx->cctx;
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	/* dry run */
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	if (cctx->drvflags & SLBT_DRIVER_DRY_RUN)
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		return 0;
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	/* context */
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	if (ectx)
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		slbt_reset_placeholders(ectx);
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	else if ((ret = slbt_get_exec_ctx(dctx,&ectx)))
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		return ret;
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	else
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		actx = ectx;
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	/* remove old .lo wrapper */
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	if (slbt_exec_compile_remove_file(dctx,ectx,ectx->ltobjname))
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		return SLBT_NESTED_ERROR(dctx);
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	/* .libs directory */
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	if (cctx->drvflags & SLBT_DRIVER_SHARED)
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		if (slbt_mkdir(dctx,ectx->ldirname)) {
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			ret = SLBT_SYSTEM_ERROR(dctx,ectx->ldirname);
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			slbt_free_exec_ctx(actx);
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			return ret;
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		}
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	/* compile mode */
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	ccwrap        = (char *)cctx->ccwrap;
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	ectx->program = ccwrap ? ccwrap : ectx->compiler;
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	ectx->argv    = ectx->cargv;
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	/* -fpic */
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	switch (cctx->tag) {
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		case SLBT_TAG_CC:
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		case SLBT_TAG_CXX:
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		case SLBT_TAG_F77:
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			fpic = cctx->settings.picswitch
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				? cctx->settings.picswitch
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				: *ectx->fpic;
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			break;
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		default:
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			fpic = *ectx->fpic;
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	}
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	/* shared library object */
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	if (cctx->drvflags & SLBT_DRIVER_SHARED) {
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		if (!(cctx->drvflags & SLBT_DRIVER_ANTI_PIC)) {
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			*ectx->dpic = "-DPIC";
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			*ectx->fpic = fpic;
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		}
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		*ectx->lout[0] = "-o";
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		*ectx->lout[1] = ectx->lobjname;
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		if (slbt_exec_compile_finalize_argument_vector(dctx,ectx))
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			return SLBT_NESTED_ERROR(dctx);
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		if (!(cctx->drvflags & SLBT_DRIVER_SILENT)) {
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			if (slbt_output_compile(dctx,ectx)) {
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				slbt_free_exec_ctx(actx);
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				return SLBT_NESTED_ERROR(dctx);
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			}
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		}
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		if (((ret = slbt_spawn(ectx,true)) < 0) || ectx->exitcode) {
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			slbt_free_exec_ctx(actx);
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			return SLBT_SYSTEM_ERROR(dctx,0);
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		}
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		if (cctx->drvflags & SLBT_DRIVER_STATIC)
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			slbt_reset_argvector(ectx);
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	}
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	/* static archive object */
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	if (cctx->drvflags & SLBT_DRIVER_STATIC) {
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		slbt_reset_placeholders(ectx);
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		if (cctx->drvflags & SLBT_DRIVER_PRO_PIC) {
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			*ectx->dpic = "-DPIC";
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			*ectx->fpic = fpic;
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		}
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		*ectx->lout[0] = "-o";
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		*ectx->lout[1] = ectx->aobjname;
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		if (slbt_exec_compile_finalize_argument_vector(dctx,ectx))
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			return SLBT_NESTED_ERROR(dctx);
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		if (!(cctx->drvflags & SLBT_DRIVER_SILENT)) {
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			if (slbt_output_compile(dctx,ectx)) {
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				slbt_free_exec_ctx(actx);
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				return SLBT_NESTED_ERROR(dctx);
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			}
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		}
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		if (((ret = slbt_spawn(ectx,true)) < 0) || ectx->exitcode) {
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			slbt_free_exec_ctx(actx);
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			return SLBT_SYSTEM_ERROR(dctx,0);
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		}
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	}
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	ret = slbt_create_object_wrapper(dctx,ectx);
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	slbt_free_exec_ctx(actx);
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	return ret ? SLBT_NESTED_ERROR(dctx) : 0;
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}