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  • #12673

Closed
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Opened Oct 08, 2016 by Ben Gamari@bgamari🐢
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bkpcabal01 testcase fails with spurious output on stderr on Darwin

The bkpcabal01 testcase introduced the by Backpack merge fails on Mac OS X with,

=====> bkpcabal01(normal) 1 of 1 [0, 0, 0]
cd "./backpack/cabal/bkpcabal01/bkpcabal01.run" && $MAKE -s --no-print-directory bkpcabal01 CLEANUP=1  
Actual stderr output differs from expected:
--- /dev/null	2016-10-08 22:51:23.000000000 +0300
+++ ./backpack/cabal/bkpcabal01/bkpcabal01.run/bkpcabal01.run.stderr.normalised	2016-10-08 22:51:23.000000000 +0300
@@ -0,0 +1,4 @@
+/Applications/Xcode-7.2/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: dist/build/p-0.1+FBOSaiWyMx9DR2UZVI6wQJ/objs-36887/libHSp-0.1+FBOSaiWyMx9DR2UZVI6wQJ.a(H.o) has no symbols
+/Applications/Xcode-7.2/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: dist/build/q-0.1+70e5o6lPGfgGiochTG2tqQ/objs-36936/libHSq-0.1+70e5o6lPGfgGiochTG2tqQ.a(I.o) has no symbols
+/Applications/Xcode-7.2/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: dist/build/p-0.1+FBOSaiWyMx9DR2UZVI6wQJ/objs-37078/libHSp-0.1+FBOSaiWyMx9DR2UZVI6wQJ.a(H.o) has no symbols
+/Applications/Xcode-7.2/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: dist/build/q-0.1+70e5o6lPGfgGiochTG2tqQ/objs-37123/libHSq-0.1+70e5o6lPGfgGiochTG2tqQ.a(I.o) has no symbols
*** unexpected failure for bkpcabal01(normal)

It seems that the problem is that ar produces a warning when producing an archive file containing an object file with no symbols,

bkpcabal01 bgamari$ make SETUP="./Setup -v3" bkpcabal01
...
("/usr/bin/ar",["-r","-s","-v","dist/build/q-0.1+70e5o6lPGfgGiochTG2tqQ/objs-39951/libHSq-0.1+70e5o6lPGfgGiochTG2tqQ.a","dist/build/q-0.1+70e5o6lPGfgGiochTG2tqQ/Q.o","dist/build/q-0.1+70e5o6lPGfgGiochTG2tqQ/I.o"])
ar: creating archive dist/build/q-0.1+70e5o6lPGfgGiochTG2tqQ/objs-39951/libHSq-0.1+70e5o6lPGfgGiochTG2tqQ.a
a - dist/build/q-0.1+70e5o6lPGfgGiochTG2tqQ/Q.o
a - dist/build/q-0.1+70e5o6lPGfgGiochTG2tqQ/I.o
/Applications/Xcode-7.2/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: dist/build/q-0.1+70e5o6lPGfgGiochTG2tqQ/objs-39951/libHSq-0.1+70e5o6lPGfgGiochTG2tqQ.a(I.o) has no symbols

In general it would be best if we could avoid linking these empty object files to avoid these spurious warnings.

Trac metadata
Trac field Value
Version 8.0.1
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Package system
Test case
Differential revisions
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Blocking
CC ezyang
Operating system
Architecture

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Reference: ghc/ghc#12673