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Bug 1321986

Summary: error: exponent has no digits
Product: [Fedora] Fedora Reporter: Marek Skalický <mskalick>
Component: gccAssignee: Jakub Jelinek <jakub>
Status: CLOSED NOTABUG QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 24CC: davejohansen, jakub, jwakely, law, mpolacek
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Last Closed: 2016-03-29 14:15:25 UTC Type: Bug
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Description Marek Skalický 2016-03-29 14:09:24 UTC 
Description of problem:
New version of gcc fails with "error: exponent has no digits"

Reproducer (test.cpp):
"
int main(){
 double x = 0xabcab.defdefP-10;
}
"

compiling with g++ -std=c++11 -o test test.cpp

With gcc-6.0.0-0.15.fc24 it works fine.

Version-Release number of selected component (if applicable):


How reproducible:
gcc-6.0.0-0.18.fc24

Actual results:
compile failure "error: exponent has no digits"

Expected results:
compilation success
Comment 1 Jakub Jelinek 2016-03-29 14:15:25 UTC 
The error is correct.  Hexadecimal floats are part of C99, C11 and the upcoming C++17 standards, while for C89, C++11 and C++14 they are just extensions.
So, you need -std=gnu89, -std=gnu++11 or -std=gnu++14 instead of -std=c89, -std=c++11 or -std=c++14 to enable them (or -std=c99, -std=c11, -std=c++17).