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GET /api/patches/2216181/?format=api
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{
    "id": 2216181,
    "url": "http://patchwork.ozlabs.org/api/patches/2216181/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/20260325231623.1549875-2-me@manueljacob.de/",
    "project": {
        "id": 17,
        "url": "http://patchwork.ozlabs.org/api/projects/17/?format=api",
        "name": "GNU Compiler Collection",
        "link_name": "gcc",
        "list_id": "gcc-patches.gcc.gnu.org",
        "list_email": "gcc-patches@gcc.gnu.org",
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    "msgid": "<20260325231623.1549875-2-me@manueljacob.de>",
    "list_archive_url": null,
    "date": "2026-03-25T23:16:23",
    "name": "[2/2] build: Set default for CPP_FOR_BUILD environment variable in all cases.",
    "commit_ref": null,
    "pull_url": null,
    "state": "new",
    "archived": false,
    "hash": "9da6fe71a630ac78a5571fe81f4d893775499db5",
    "submitter": {
        "id": 92972,
        "url": "http://patchwork.ozlabs.org/api/people/92972/?format=api",
        "name": "Manuel Jacob",
        "email": "me@manueljacob.de"
    },
    "delegate": null,
    "mbox": "http://patchwork.ozlabs.org/project/gcc/patch/20260325231623.1549875-2-me@manueljacob.de/mbox/",
    "series": [
        {
            "id": 497520,
            "url": "http://patchwork.ozlabs.org/api/series/497520/?format=api",
            "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=497520",
            "date": "2026-03-25T23:16:23",
            "name": "[1/2] build: Preserve *_FOR_BUILD environment variables in all cases.",
            "version": 1,
            "mbox": "http://patchwork.ozlabs.org/series/497520/mbox/"
        }
    ],
    "comments": "http://patchwork.ozlabs.org/api/patches/2216181/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/2216181/checks/",
    "tags": {},
    "related": [],
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        "From": "Manuel Jacob <me@manueljacob.de>",
        "To": "gcc-patches@gcc.gnu.org",
        "Cc": "Manuel Jacob <me@manueljacob.de>",
        "Subject": "[PATCH 2/2] build: Set default for CPP_FOR_BUILD environment variable\n in all cases.",
        "Date": "Thu, 26 Mar 2026 00:16:23 +0100",
        "Message-ID": "<20260325231623.1549875-2-me@manueljacob.de>",
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    },
    "content": "A default was set in the `\"${build}\" != \"${host}\"` case, but not in the `\"${build}\" = \"${host}\"` case.\n\nFor a working build, this change should not make any difference. CPP_FOR_BUILD is passed to build modules as CPP. If not set, autoconf macro AC_PROG_CC infers CPP by trying various programs. First, it tries \"$CC -E\", which CPP will default to in all cases with this patch.\n\nThe following command produces the same build directory with and without the patch:\n\n./configure --build=x86_64-make_autoconf_enable_cross_compiling-linux-gnu --host=x86_64-linux-gnu\n\nThe following command produces a Makefile containing `CPP_FOR_BUILD = ` without the patch and containing `CPP_FOR_BUILD = $(CC_FOR_BUILD) -E` with the patch:\n\n./configure\n\nChangeLog:\n\n\t* configure.ac: Set default for CPP_FOR_BUILD environment variable in all cases.\n\t* configure: Regenerate.\n---\n configure    | 2 +-\n configure.ac | 2 +-\n 2 files changed, 2 insertions(+), 2 deletions(-)",
    "diff": "diff --git a/configure b/configure\nindex 9a6407d2c6f..e2150f50aac 100755\n--- a/configure\n+++ b/configure\n@@ -4318,7 +4318,6 @@ if test \"${build}\" != \"${host}\" ; then\n   AR_FOR_BUILD=${AR_FOR_BUILD-ar}\n   AS_FOR_BUILD=${AS_FOR_BUILD-as}\n   CC_FOR_BUILD=${CC_FOR_BUILD-gcc}\n-  CPP_FOR_BUILD=\"${CPP_FOR_BUILD-\\$(CC_FOR_BUILD) -E}\"\n   CXX_FOR_BUILD=${CXX_FOR_BUILD-g++}\n   DLLTOOL_FOR_BUILD=${DLLTOOL_FOR_BUILD-dlltool}\n   DSYMUTIL_FOR_BUILD=${DSYMUTIL_FOR_BUILD-dsymutil}\n@@ -4350,6 +4349,7 @@ else\n   WINDRES_FOR_BUILD=\"${WINDRES_FOR_BUILD-\\$(WINDRES)}\"\n   WINDMC_FOR_BUILD=\"${WINDMC_FOR_BUILD-\\$(WINDMC)}\"\n fi\n+CPP_FOR_BUILD=\"${CPP_FOR_BUILD-\\$(CC_FOR_BUILD) -E}\"\n \n ac_ext=c\n ac_cpp='$CPP $CPPFLAGS'\ndiff --git a/configure.ac b/configure.ac\nindex 0854638e8e8..edd53b2bb42 100644\n--- a/configure.ac\n+++ b/configure.ac\n@@ -1453,7 +1453,6 @@ if test \"${build}\" != \"${host}\" ; then\n   AR_FOR_BUILD=${AR_FOR_BUILD-ar}\n   AS_FOR_BUILD=${AS_FOR_BUILD-as}\n   CC_FOR_BUILD=${CC_FOR_BUILD-gcc}\n-  CPP_FOR_BUILD=\"${CPP_FOR_BUILD-\\$(CC_FOR_BUILD) -E}\"\n   CXX_FOR_BUILD=${CXX_FOR_BUILD-g++}\n   DLLTOOL_FOR_BUILD=${DLLTOOL_FOR_BUILD-dlltool}\n   DSYMUTIL_FOR_BUILD=${DSYMUTIL_FOR_BUILD-dsymutil}\n@@ -1485,6 +1484,7 @@ else\n   WINDRES_FOR_BUILD=\"${WINDRES_FOR_BUILD-\\$(WINDRES)}\"\n   WINDMC_FOR_BUILD=\"${WINDMC_FOR_BUILD-\\$(WINDMC)}\"\n fi\n+CPP_FOR_BUILD=\"${CPP_FOR_BUILD-\\$(CC_FOR_BUILD) -E}\"\n \n AC_PROG_CC_C99\n AC_PROG_CXX\n",
    "prefixes": [
        "2/2"
    ]
}