[OE-core] [PATCH 2/6] libgpg-error: Add -P option to CPPFLAGS

[Khem Raj]

Fixes https://www.mail-archive.com/debian-bugs-dist@lists.debian.org/msg1301822.html

libgpg-error FTBFS when built with gcc-5. Here is the relevant excerpt:

| Making all in src
| make[4]: Entering directory '/tmp/buildd/libgpg-error/libgpg-error-1.17/src'
| gawk -f ./mkstrtable.awk -v textidx=3 \
|         ./err-sources.h.in >err-sources.h
| gawk -f ./mkstrtable.awk -v textidx=3 \
|         ./err-codes.h.in >err-codes.h
| gawk -f ./mkerrnos.awk ./errnos.in >code-to-errno.h
| gawk -f ./mkerrcodes1.awk ./errnos.in >_mkerrcodes.h
| gcc -E -D_FORTIFY_SOURCE=2  _mkerrcodes.h | grep GPG_ERR_ | \
|                gawk -f ./mkerrcodes.awk >mkerrcodes.h
| rm _mkerrcodes.h
| gcc -I. -I. -o mkerrcodes ./mkerrcodes.c
| In file included from ./mkerrcodes.c:26:0:
| ./mkerrcodes.h:9:5: error: expected expression before ',' token
|    { , "GPG_ERR_E2BIG" },
|      ^

It makes invalid assumptions on undefined behaviour of gcc. To see why,
let us look at the contents of the intermediate steps:

_mkerrcodes.h (deleted):
| ...
| #ifdef E2BIG
| E2BIG   GPG_ERR_E2BIG
| #endif
| #ifdef WSAE2BIG
| WSAE2BIG        GPG_ERR_E2BIG
| #endif
| ...

gcc -E -D_FORTIFY_SOURCE=2  _mkerrcodes.h | grep -v '^$':
| ...
| # 26 "_mkerrcodes.h" 2
| 7
| # 31 "_mkerrcodes.h"
|      GPG_ERR_E2BIG
| # 37 "_mkerrcodes.h" 3 4
| 13
| # 37 "_mkerrcodes.h"
|       GPG_ERR_EACCES
| ...

As can be seen here, the cpp from gcc-5 can split lines and "grep
GPG_ERR_" fails to account for that.

Change-Id: I6f1476e4afc7163ebc3a05106ceaa3b83e3fab3e
Signed-off-by: Khem Raj <raj.khem at gmail.com>
---
 meta/recipes-support/libgpg-error/libgpg-error_1.18.bb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/meta/recipes-support/libgpg-error/libgpg-error_1.18.bb b/meta/recipes-support/libgpg-error/libgpg-error_1.18.bb
index 9501b67..6d11605 100644
--- a/meta/recipes-support/libgpg-error/libgpg-error_1.18.bb
+++ b/meta/recipes-support/libgpg-error/libgpg-error_1.18.bb
@@ -19,7 +19,7 @@ SRC_URI[sha256sum] = "9ff1d6e61d4cef7c1d0607ceef6d40dc33f3da7a3094170c3718c00153
 BINCONFIG = "${bindir}/gpg-error-config"
 
 inherit autotools binconfig-disabled pkgconfig gettext
-
+CPPFLAGS += "-P"
 do_compile_prepend() {
 	TARGET_FILE=linux-gnu
 	if [ ${TARGET_OS} != "linux" ]; then
-- 
2.1.4