From 2d14ae6bea4af444ca77e9f6e7d3898a3f39b2d3 Mon Sep 17 00:00:00 2001 From: Tomasz Figa Date: Wed, 14 Dec 2016 17:00:27 +0900 Subject: [PATCH] configure.ac: Respect LLVM_CFLAGS in LLVM version detection When compiling LLVM headers, including llvm-config.h, we need to respect LLVM_CFLAGS. This is especially crucial if LLVM is located in a non-standard location and it happens that llvm-config.h includes another header. In such case the detection would fail due to missing header, because the path is provided in LLVM_CFLAGS. Let's add LLVM_CFLAGS to global CFLAGS for the time of detection and then restore the original flags, as done in other places of the script. Signed-off-by: Tomasz Figa Reviewed-by: Emil Velikov --- configure.ac | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/configure.ac b/configure.ac index 655b76ed6e6..182d0726c30 100644 --- a/configure.ac +++ b/configure.ac @@ -979,6 +979,10 @@ llvm_set_environment_variables() { LLVM_INCLUDEDIR=`$LLVM_CONFIG --includedir` LLVM_LIBDIR=`$LLVM_CONFIG --libdir` + # We need to respect LLVM_CFLAGS when compiling LLVM headers. + save_CFLAGS="$CFLAGS" + CFLAGS="$CFLAGS $LLVM_CFLAGS" + AC_COMPUTE_INT([LLVM_VERSION_MAJOR], [LLVM_VERSION_MAJOR], [#include "${LLVM_INCLUDEDIR}/llvm/Config/llvm-config.h"]) AC_COMPUTE_INT([LLVM_VERSION_MINOR], [LLVM_VERSION_MINOR], @@ -986,6 +990,8 @@ llvm_set_environment_variables() { AC_COMPUTE_INT([LLVM_VERSION_PATCH], [LLVM_VERSION_PATCH], [#include "${LLVM_INCLUDEDIR}/llvm/Config/llvm-config.h"]) + CFLAGS="$save_CFLAGS" + # Only needed for LLVM < 3.6.0 if test -z "$LLVM_VERSION_PATCH"; then LLVM_VERSION_PATCH=0 -- 2.30.2